Ncert- class 6- science-Chapter 11: Air Around Us 1 Welcome to your Ncert- class 6- science-Chapter 11: Air Around Us 1 1. Which is the most abundant gas in our atmosphere ? Carbon dioxide Carbon monoxide Oxygen Nitrogen None 2. Combustion can not take place without: Air water carbon zinc None 3. What is the major constituent of air Water vapour Hydrogen Oxygen Nitrogen None 4. Glass panes usually appear hazy because: water vapour settling on the tiny dust particles. it is the property of transparent substances they are old. None None 5. John finds that, as he blows air into a balloon, it becomes bigger. What inference can John make? Air is a gas. Air has mass Air is matter Air occupies space None 6. Carbon dioxide constitutes nearly ___ % of the atmosphere. 45 0.03 78 28 None 7. It is not proper to breathe through our mouth because: the dust particles would enter our bodies more carbon dioxide will be inhaled our throat will become sore we will catch cold easily None 8. A greenhouse gas that absorbs energy and maintains earth's temperature is: nitrogen oxygen carbon dioxide argon None 9. Air is regarded as a mixture because: its composition may vary its pressure may vary its volume changes under different conditions its temperature may change None 10. The correct ascending order of gases as per their composition in air is: oxygen < carbon dioxide < nitrogen hydrogen < oxygen < nitrogen nitrogen < hydrogen < oxygen oxygen < carbon dioxide < hydrogen None 11. Carbon exists in the atmosphere in the form of: coal carbon dioxide only carbon monoxide in traces and carbon dioxide carbon monoxide only None 12. Which one of the following gas does not form a part of the atmosphere? Nitrogen Carbon dioxide Oxygen Chlorine None 13. Which of the following gases burns in air Nitrogen Helium Carbon monoxide Carbon dioxide None 14. Choose the option which justifies the given statement:-Air is considered a mixture, not a compound. It is possible to separate air into its constituent gases by physical methods like fractional distillation. All of the above Air shows properties same as the constituent gases present in it. Air does not have a fixed formula like compounds. None 15. __________ is the most abundant gas in the atmosphere. None of the above Oxygen Nitrogen Carbon dioxide None 16. Which of these statements are true about air?(i) Air is a mixture of several types of gases.(ii) Air exerts pressure.(iii) The composition of air is constant in the atmosphere. (ii) and (iii) (i), (ii) and (iii) (i) and (iii) (i) and (ii) None 17. Which of the following gases do not form part of the atmosphere? Carbon idoxide Chlorine Oxygen Nitrogen None 18. Air has________ composition with________ oxygen at high attitudes. fixed, less variable, less variable, more fixed, more None 19. The percentage of nitrogen and oxygen in air is: 37% by weight 50% by weight 99% by volume 21% by volume None 20. What process replenishes the atmosphere with oxygen? Oxygen Cycle Water Cycle Both A and C Photosynthesis None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
